@article{AGWG_1939__19_1939_135627,
     author = {Richter Gerhard},
     title = {Problem},
     journal = {Abhandlungen der Gesellschaft der Wissenschaften in G\"ottingen, Mathematisch-Physikalische Klasse},
     pages = {355--355},
     publisher = {mathdoc},
     volume = {19_1939},
     year = {1939},
     url = {http://geodesic.mathdoc.fr/item/AGWG_1939__19_1939_135627/}
}